Malin had always carried a sense of regret and guilt for the girl named Sara and her friends. He had sworn to avenge Sara and them, but over the years, he still couldn't identify the culprit. These days, even the police in Carterburg were running out of patience. If it weren't for Malin occasionally following up, forcing them to give at least some sort of response, the officers wouldn't even have bothered to feign effort.
Moreover, it had been too long—a time so prolonged that even Sara's family had stopped pursuing the case. As for her friends… well, in this era, every family had many children, losing one or two was perceived as an acceptable loss. When the investigation yielded no progress and the initial heartbreak faded… Sara and her friends ended up residing only in Malin's memory.
Thus, as someone who knew them, Malin felt embarrassed to push the police officers too hard.
But after the incident with Mendel, Malin decided he could no longer let the killer get away.